JPS6232766Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvement of a grinding wheel shaft for an internal grinder.

Conventionally, grinding fluid in internal grinding work has been handled by injecting water into the grinding point from the outside through a pipe or nozzle, but this has hindered confirmation of the grinding point during work, impairing work efficiency. Especially when grinding small-diameter workpieces, it has been difficult to manufacture nozzles. In addition, the pressurized grinding fluid collides with the workpiece and the grinding wheel and enters the inside through the gap between the grinding wheel shafts, causing an inconvenient situation in which the bearing seizes.

Therefore, the present invention has been developed in view of the above, and is an attempt to provide a grinding wheel shaft that ideally injects water into the grinding point of the grinding wheel and prevents water and abrasive powder from entering through the gap in the grinding wheel shaft using an air curtain. The idea was to cut a thread in the direction of sending out water with a large lead from the bearing part of the grinding wheel shaft to the outer periphery of the tip, install a cylindrical cover on the front part of the grinding wheel head member to cover this threaded part, and install the grinding fluid inside the mounting base of this cover. A supply port is provided, an air port is provided in the grinding wheel head member so as to hang on the rear end of the screw on the outside of the grinding wheel shaft bearing, and a passage for pressurized air leading to the air port is provided in the grinding wheel head member. .

Embodiments of the present invention will be described below based on the drawings. A sleeve 2 side of an internal grinding shaft is fixed to a grindstone head 1 placed and fixed on a table of an internal grinding machine, and a bracket 3 is fixed to the front surface of the sleeve 2 side. A stator 7 is attached to the inside of the sleeve 2 of the internal grinding shaft, and a grinding wheel shaft 6 with an internal grinding wheel 8 fixed to its tip is rotatably supported by the inner bearing 4 and the bearing 5 of the bracket 3. A rotor 6a is integrally attached thereto. Grinding wheel head 1, inner grinding shaft sleeve 2,
and a pressurized air supply path 9 communicating with the bracket 3.
One or more a, 9b, 9c are provided, and one or more grinding fluid passages 10a, 10b are provided in communication with the internal grinding shaft sleeve 2 and bracket 3, respectively. A lid 11 is fitted into the center of the bracket 3, and an annular groove 11a is cut into the inner periphery of the lid 11 to serve as an air port between the lid 11 and the outer periphery of the grinding wheel shaft 6. It is ejected to the grindstone 8 side through the gap. This lid 11
Also, a hole 11b communicating with the grinding fluid passage 10b is opened obliquely toward the grinding wheel axis. Grinding wheel shaft 6
A water drain screw 12 with a large lead is carved on the outer periphery of the lid 11 or a portion protruding from it, which sends water to the grindstone by rotation of the grindstone shaft. A cylindrical cover 13 is fastened to the lid 11 with a gap between it and the grindstone shaft 6 so as to cover this threaded portion.

Next, the action will be explained. To begin grinding the workpiece, the table is moved, the grindstone head 1 approaches the workpiece, the grindstone shaft 6 is rotated, and pressurized air flows through the passages 9a, 9b,
The air is sent to the air pot 11a via the air port 9c to generate static pressure and is air-sealed to protect the bearing 5, and the pressurized air is blown out through the gap between the grindstone shaft 6 and the cover 13 and through the drain screw. As the pressurized air blows out, the grinding fluid is also sent to the gap between the grinding wheel shaft 6 and the cover 13 through the passages 10a, 10b, and 11b. The liquid wets the grindstone shaft due to its adhesive force, is sent to the grindstone 8 side at high speed by the feed force of the draining screw 12 due to the high speed rotation of the grindstone shaft, and the pressurized air, and is poured into the grinding point between the workpiece and the grindstone 8.

As detailed above, the present invention has a grinding fluid injection member on the grinding wheel head member and the grinding wheel shaft side, and pressurized air is ejected from behind the grinding fluid, so there is no need to install a special nozzle externally, and it is suitable for small-diameter internal grinding work. In addition to improving workability, the supply of grinding fluid to the grinding point was accelerated and sufficient water injection was achieved, eliminating the risk of grinding burns. In addition, an air pot is provided on the outside of the bearing behind the grinding fluid to form an air seal, which eliminates the risk of the grinding fluid entering the bearing portion of the grinding wheel shaft, and the air pot increases the shaft rigidity of the tip of the grinding wheel shaft. Furthermore, since there is no addition to the grinding wheel shaft for sending out grinding fluid or pressurized air, there is no cause of vibration, and highly accurate machining is possible at high speed rotations of tens of thousands of revolutions.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of the grinding wheel shaft of the present invention. 6...Whetstone shaft, 8...Whetstone, 9a, 9b, 9c
...Pressure air passage, 10a, 10b, 11b...
Grinding fluid passage, 12... Drain screw, 13... Cylindrical cover.

Claims (1)

[Scope of utility model registration request] In the grinding wheel shaft of an internal grinder, a rough draining screw is carved on the outer periphery of the tip of the grinding wheel shaft away from the bearing part of the grinding wheel shaft, and a rough draining thread is carved in the direction of sending out water by rotation, and the draining screw part is covered with a gap while maintaining a cylindrical shape. A cover is provided in the front part of the grinding wheel head member, a grinding fluid supply path that opens inside the mounting base of the cover is provided in the grinding wheel head member, and an end of the drain screw is provided outside of the grinding wheel shaft bearing and inside of the opening position. An air pot is provided in the grinding wheel head member so as to be similar to the above, and a pressure air passage leading to the air pot is provided in the grinding wheel head member, and pressurized air is ejected from behind the grinding fluid to air-seal the bearing and accelerate the grinding fluid. A water-filled grindstone shaft that is characterized by: